NOTE: Anything passed to DockerService should be eventually handled in another way when we switch to running the shim as a different process.

DockerImageIDPrefix is the prefix of image id in container status.

DockerPullableImageIDPrefix is the prefix of pullable image id in container status.

CheckpointData contains all types of data that can be stored in the checkpoint.

FileStore is an implementation of CheckpointStore interface which stores checkpoint in files.

NetworkPluginSettings is the subset of kubelet runtime args we pass to the container runtime shim so it can probe for network plugins.

PersistentCheckpointHandler is an implementation of CheckpointHandler.

PodSandboxCheckpoint is the checkpoint structure for a sandbox.

PortMapping is the port mapping configurations of a sandbox.

CheckpointHandler provides the interface to manage PodSandbox checkpoint.

CheckpointStore provides the interface for checkpoint storage backend.

DockerService is an interface that embeds the new RuntimeService and ImageService interfaces.